On the application of software metrics to UML models

In this position paper we discuss a number of issues relating to model metrics, with particular emphasis on metrics for UML models. Our discussion is presented as a series of nine observations where we examine some of the existing work on applying metrics to UML models, present some of our own work in this area, and specify some topics for future research that we regard as important. Furthermore, we identify three categories of challeges for model metrics and describe how our nine observations can be partitioned into these categories.